---
title: "CVE-2026-90464: WatchGuard Fireware OS - Path Traversal"
description: "WatchGuard Fireware OS firewall contains an external control of file path vulnerability in diagnostic command, letting remote authenticated attackers with read-only Device Monitor privileges create or overwrite files and modify kernel parameters with root privileges, exploit requires management CLI access."
url: https://panop.io/threat-heartbeat/CVE-2026-90464/
---

# CVE-2026-90464 WatchGuard Fireware OS - Path Traversal

WatchGuard Fireware OS firewall contains an external control of file path vulnerability in diagnostic command, letting remote authenticated attackers with read-only Device Monitor privileges create or overwrite files and modify kernel parameters with root privileges, exploit requires management CLI access.

CVSS base score 7.2 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.36% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-90464)

## Details

Type

Path Traversal

Impact

File System Write, Privilege Escalation

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Published

27 October 2026

Updated

29 October 2026

Weakness

[CWE-59](https://cwe.mitre.org/data/definitions/59.html)

## Vendor fix

Update to the latest Fireware OS version with the vulnerability fixed.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-90464](https://nvd.nist.gov/vuln/detail/CVE-2026-90464)
- [https://psirt.watchguard.com/CVE-2026-90464](https://psirt.watchguard.com/CVE-2026-90464)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

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